Homes have been evacuated after a sinkhole opened up on a housing estate.
Local councillor David Hughes said it was believed a culvert had collapsed, creating a big hole at Nant Morlais, in Pant, Merthyr Tydfil.
South Wales Police, South Wales Fire and Rescue Service and Merthyr Tdyfil council confirmed they were alerted on Sunday morning.
Mr Hughes said residents of Nant Morlais - about 30 homes - have been evacuated. The cul-de-sac has been closed and people are being advised to avoid the area.